from django.db import transaction
from django.utils import timezone
from rest_framework import serializers

from funkwhale_api.common import serializers as common_serializers
from funkwhale_api.music import models as music_models
from funkwhale_api.requests import models as requests_models
from funkwhale_api.users import models as users_models

from . import filters


class ManageTrackFileArtistSerializer(serializers.ModelSerializer):
    class Meta:
        model = music_models.Artist
        fields = ["id", "mbid", "creation_date", "name"]


class ManageTrackFileAlbumSerializer(serializers.ModelSerializer):
    artist = ManageTrackFileArtistSerializer()

    class Meta:
        model = music_models.Album
        fields = (
            "id",
            "mbid",
            "title",
            "artist",
            "release_date",
            "cover",
            "creation_date",
        )


class ManageTrackFileTrackSerializer(serializers.ModelSerializer):
    artist = ManageTrackFileArtistSerializer()
    album = ManageTrackFileAlbumSerializer()

    class Meta:
        model = music_models.Track
        fields = ("id", "mbid", "title", "album", "artist", "creation_date", "position")


class ManageTrackFileSerializer(serializers.ModelSerializer):
    track = ManageTrackFileTrackSerializer()

    class Meta:
        model = music_models.TrackFile
        fields = (
            "id",
            "path",
            "source",
            "filename",
            "mimetype",
            "track",
            "duration",
            "mimetype",
            "creation_date",
            "bitrate",
            "size",
            "path",
        )


class ManageTrackFileActionSerializer(common_serializers.ActionSerializer):
    actions = [common_serializers.Action("delete", allow_all=False)]
    filterset_class = filters.ManageTrackFileFilterSet

    @transaction.atomic
    def handle_delete(self, objects):
        return objects.delete()


class PermissionsSerializer(serializers.Serializer):
    def to_representation(self, o):
        return o.get_permissions(defaults=self.context.get("default_permissions"))

    def to_internal_value(self, o):
        return {"permissions": o}


class ManageUserSimpleSerializer(serializers.ModelSerializer):
    class Meta:
        model = users_models.User
        fields = (
            "id",
            "username",
            "email",
            "name",
            "is_active",
            "is_staff",
            "is_superuser",
            "date_joined",
            "last_activity",
            "privacy_level",
        )


class ManageUserSerializer(serializers.ModelSerializer):
    permissions = PermissionsSerializer(source="*")

    class Meta:
        model = users_models.User
        fields = (
            "id",
            "username",
            "email",
            "name",
            "is_active",
            "is_staff",
            "is_superuser",
            "date_joined",
            "last_activity",
            "permissions",
            "privacy_level",
        )
        read_only_fields = [
            "id",
            "email",
            "privacy_level",
            "username",
            "date_joined",
            "last_activity",
        ]

    def update(self, instance, validated_data):
        instance = super().update(instance, validated_data)
        permissions = validated_data.pop("permissions", {})
        if permissions:
            for p, value in permissions.items():
                setattr(instance, "permission_{}".format(p), value)
            instance.save(
                update_fields=["permission_{}".format(p) for p in permissions.keys()]
            )
        return instance


class ManageInvitationSerializer(serializers.ModelSerializer):
    users = ManageUserSimpleSerializer(many=True, required=False)
    owner = ManageUserSimpleSerializer(required=False)
    code = serializers.CharField(required=False, allow_null=True)

    class Meta:
        model = users_models.Invitation
        fields = ("id", "owner", "code", "expiration_date", "creation_date", "users")
        read_only_fields = ["id", "expiration_date", "owner", "creation_date", "users"]

    def validate_code(self, value):
        if not value:
            return value
        if users_models.Invitation.objects.filter(code__iexact=value).exists():
            raise serializers.ValidationError(
                "An invitation with this code already exists"
            )
        return value


class ManageInvitationActionSerializer(common_serializers.ActionSerializer):
    actions = [
        common_serializers.Action(
            "delete", allow_all=False, qs_filter=lambda qs: qs.open()
        )
    ]
    filterset_class = filters.ManageInvitationFilterSet

    @transaction.atomic
    def handle_delete(self, objects):
        return objects.delete()


class ManageImportRequestSerializer(serializers.ModelSerializer):
    user = ManageUserSimpleSerializer(required=False)

    class Meta:
        model = requests_models.ImportRequest
        fields = [
            "id",
            "status",
            "creation_date",
            "imported_date",
            "user",
            "albums",
            "artist_name",
            "comment",
        ]
        read_only_fields = [
            "id",
            "status",
            "creation_date",
            "imported_date",
            "user",
            "albums",
            "artist_name",
            "comment",
        ]

    def validate_code(self, value):
        if not value:
            return value
        if users_models.Invitation.objects.filter(code__iexact=value).exists():
            raise serializers.ValidationError(
                "An invitation with this code already exists"
            )
        return value


class ManageImportRequestActionSerializer(common_serializers.ActionSerializer):
    actions = [
        common_serializers.Action(
            "mark_closed",
            allow_all=True,
            qs_filter=lambda qs: qs.filter(status__in=["pending", "accepted"]),
        ),
        common_serializers.Action(
            "mark_imported",
            allow_all=True,
            qs_filter=lambda qs: qs.filter(status__in=["pending", "accepted"]),
        ),
        common_serializers.Action("delete", allow_all=False),
    ]
    filterset_class = filters.ManageImportRequestFilterSet

    @transaction.atomic
    def handle_delete(self, objects):
        return objects.delete()

    @transaction.atomic
    def handle_mark_closed(self, objects):
        return objects.update(status="closed")

    @transaction.atomic
    def handle_mark_imported(self, objects):
        now = timezone.now()
        return objects.update(status="imported", imported_date=now)